Low-Cost Boost Converter 3.3V Input – 5V Output at 250mA

  • Rajkumar Sharma
  • 212 Views
  • easy
  • Tested
  • SKU: EL135097
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This is a low-cost boost converter that converts a 3.3V input to 5V at 250mA load current. The LM2578A chip is used to build this project. The LM2578A is a switching regulator which can easily be set up for such DC-to-DC voltage conversion circuits as the buck, boost and inverting configurations. In this board, the IC is configured as a boost converter. The operating frequency is 50Khz.

Features

  • Input Voltage 3.3V
  • Output Voltage 5V DC (+/-5%)
  • Output Current 250mA
  • Efficiency Approx 80%
  • Current Limit 2A
  • Operating Frequency 50Khz
  • Thermal Shutdown
  • PCB Dimensions 38.58 x 17.94mm

Connections

  • CN1: Pin 1 = 3.3V DC Input, Pin 2 = GND
  • CN2: Pin 1 = 5V DC Output, Pin 2 = GND

The boost or step-up converter converts a DC voltage to a higher DC voltage. When the switch software is turned on, energy is stored in the inductor L and the inductor current iL ramps up at a slope determined by the input voltage. Diode D is off during this period. Once the switch, SW, turns off, diode D starts to conduct and the energy stored in the inductor is released to the load. Current in the inductor ramps down at a slope determined by the difference between the input and output voltages.

The LM2578A is a switching regulator which can easily be set up for such DC-to-DC voltage conversion circuits as the buck, boost and inverting configurations. The LM2578A features a unique comparator input stage which not only has separate pins for both the inverting and non-inverting inputs but also provides an internal 1.0V reference to each input, thereby simplifying circuit design and p.c. board layout. The output can switch up to 750 mA and has output pins for its collector and emitter to promote design flexibility. An external current limit terminal may be referenced to either the ground or the Vin terminal, depending upon the application. In addition, the LM2578A has an onboard oscillator, which sets the switching frequency with a single external capacitor from <1 Hz to 100 kHz (typical).

Schematic

Parts List

NOQNTYREF.DESCMANUFACTURERSUPPLIERSUPPLIER PART NO
12CN1,CN22 PIN MALE HEADER PITCH 2.54MMWURTHDIGIKEY732-5315-ND
21C1220uF/16V ELECTROLYTIC 6.3MM ELITEDIGIKEY4191-EV1C221MP26311EUCT-ND
31C2470uF/16V ELECTROLYTIC 8MMNICHICONDIGIKEYUVR1C471MPDDTB-ND
43C3,C4,C61nF/50V CERAMIC SMD SIZE 0805MURATA/YAGEODIGIKEY
51C522PF/50V CERAMIC SMD SIZE 0805MURATA/YAGEODIGIKEY
61D1SS34 FAST SWITCHING DIODEONSEMIDIGIKEYSS34FSCT-ND
71L133uH/2A PULSE ELECTRONICSDIGIKEY553-AWVS00808040330M00CT-ND
81Q1MJD44H11T4G DPKONSEMIDIGIKEYMJD44H11T4GOSCT-ND
91R1140K 1% SMD SIZE 0805MURATA/YAGEODIGIKEY
101R211K 1% SMD SIZE 0805MURATA/YAGEODIGIKEY
112R3,R7200E 1% SMD SIZE 0805MURATA/YAGEODIGIKEY
121R40.05E 1% SMD SIZE 2512MURATA/YAGEODIGIKEY
131R51E 1% SMD SIZE 0805MURATA/YAGEODIGIKEY
141R643K 1% SMD SIZE 0805MURATA/YAGEODIGIKEY
151U1LM3578 SOIC8TIDIGIKEY296-35906-1-ND

Connections

Gerber View

Photos

Video

LM2578A Datasheet

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